Use of Subquery with Insert update and delete in mysql|| MySQL Tutorial|| Code With Neha
In my previous video of mysql series I have discussed about type of subqueries
You can check the video from the above i button
Today I am going to discuss about how to use subquery with different statement such as insert ,update delete
So without any further delay let's get started
subquery in SQL is a query nested inside another SQL query. It allows complex filtering, aggregation and data manipulation by using the result of one query inside another. They are an essential tool when we need to perform operations like:
Filtering: selecting rows based on conditions from another query.
Aggregating: applying functions like SUM, COUNT, AVG with dynamic conditions.
Updating: modifying data using values from other tables.
Deleting: removing rows based on criteria from another query.
While there is no universal syntax for subqueries, they are commonly used in SELECT statements as follows.
Syntax:
SELECT column_name
FROM table_name
WHERE column_name expression operator
(SELECT column_name FROM table_name WHERE ...);
Common SQL Clauses for Subqueries
Clauses that can be used with subqueries are:
WHERE: filter rows based on subquery results.
FROM: treat subquery as a temporary (derived) table.
HAVING: filter aggregated results after grouping.
I will disscuss how subquerries are used with from and join in my next video
That's it for today
Hope you all will get some help from this video
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See you in the next video till then Stay Safe Stay Happy
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